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media: mt9m114: Put sensor in reset on power down

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Put the sensor back in reset on power down. Putting the sensor in reset
reduces power-consumption by putting all the data / ctrl pins in High-Z
mode. This helps save power on designs where the regulators may need to
stay on while the sensor is powered down.

This also ensures that the sensor is properly reset on power up,
since now the sensor will see a reset high to low transition after
the regulators have been turned on.

Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Signed-off-by: Hans de Goede <johannes.goede@oss.qualcomm.com>
Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
This commit is contained in:
Hans de Goede 2025-12-30 18:03:04 +01:00 committed by Hans Verkuil
parent 84359d0a5e
commit d6b6a23bb4
1 changed files with 7 additions and 0 deletions
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7
drivers/media/i2c/mt9m114.c
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@ -2228,6 +2228,13 @@ static int mt9m114_power_on(struct mt9m114 *sensor)
static void mt9m114_power_off(struct mt9m114 *sensor)
{
unsigned int duration;
gpiod_set_value(sensor->reset, 1);
/* Power off takes 10 clock cycles. Double it to be safe. */
duration = DIV_ROUND_UP(2 * 10 * 1000000, clk_get_rate(sensor->clk));
fsleep(duration);
clk_disable_unprepare(sensor->clk);
regulator_bulk_disable(ARRAY_SIZE(sensor->supplies), sensor->supplies);
}